Payroll cost for a Roman Legion – Part 1 of 2

What was the payroll cost to staff a Roman Legion?
Earlier post discussed that until around 81 A.D. a Legionnaire was paid 225 sesterces a year.
With the help of a Wikipedia article, we can make a guess at the total payroll for a Legion. (A side note, amusing to me, is that several of the sources of this article are books I’ve previously read.)
As the first step, let’s look at the estimated staffing of a Roman Legion in about 100 A.D. Keep in mind this is assuming the Legion is fully staffed, which was never the case, as I’ve read in several places. This is also for a legion with 50 centuries instead of the authorized strength of 60 centuries earlier.
Staffing for Roman Legion in about 100 A.D.: